Control method of gas water heater and gas water heater

Abstract

The invention relates to the technical field of hot water supply equipment, and discloses a control method of a gas water heater and the gas water heater, and the control method comprises the steps that under the condition that the gas water heater is in a working state, real-time water flow is obtained; if the real-time water flow is smaller than the preset threshold value, a target bypass ratio is obtained according to the real-time water flow; and under the condition that the current gear of the bypass valve is kept unchanged, the gas water heater is controlled to work based on the target bypass ratio. The situation that the actual bypass ratio is different from the preset bypass ratio corresponding to the gear due to the fact that the bypass pipe is not filled with water flow when the water flow is small can be avoided, the bypass ratio can be adjusted in a self-adaptive mode according to the real-time water flow, the gas water heater is made to control heating through the target bypass ratio, and then the error of the outlet water temperature is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hot water supply equipment, and in particular to a control method for a gas water heater and a gas water heater. Background Art

[0002] During the use of gas water heaters, a bypass pipe is installed between the water inlet pipe and the water outlet pipe, so that cold water can flow directly into the water outlet pipe and mix with hot water, thereby achieving the effect of mixing cold and hot water. A bypass valve is usually set on the bypass pipe to adjust the bypass ratio, thereby adjusting the ratio of cold and hot water.

[0003] In the related technology, the controller will store the fixed bypass ratio corresponding to the gear position of the bypass valve, and then perform calculations based on the fixed bypass ratio to reduce the outlet water temperature fluctuation. For example, the fixed bypass ratio corresponding to the target gear position, the user-set outlet water temperature and the inlet water temperature will be used to obtain the required heat exchanger water temperature, so that the burner power can be adjusted according to the real-time heat exchanger water temperature and the required heat exchanger water temperature, and finally the outlet water temperature of the water heater is stabilized at the user-set outlet water temperature.

[0004] However, during the operation of the gas water heater, when the bypass valve position remains unchanged, the actual bypass ratio may also be affected by the current water flow rate. When the water flow rate is small, the water flow may not be able to fill the bypass pipe. There is a deviation between the actual bypass ratio and the fixed bypass ratio corresponding to the current bypass valve position, which leads to problems in the logic of the gas water heater operating with a fixed bypass ratio.

[0005] Therefore, how to ensure that the bypass used in the logic operation of the gas water heater is more accurate has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a control method for a gas water heater, which effectively solves the problem of deviation in the outlet water temperature of the water heater caused by an inaccurate bypass ratio.

[0007] The technical problem solved by the present invention is to provide a gas water heater, which effectively solves the problem of deviation in the outlet water temperature of the water heater.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A control method for a gas water heater, the method comprising:

[0010] When the gas water heater is in working state, obtain the real-time water flow;

[0011] If the real-time water flow rate is less than a preset threshold, a target bypass ratio is obtained according to the real-time water flow rate, and the target bypass ratio is positively correlated with the real-time water flow rate;

[0012] Under the condition that the current gear position of the bypass valve remains unchanged, the gas water heater is controlled to operate based on the target bypass ratio, and the target bypass ratio is smaller than the preset bypass ratio corresponding to the current gear position of the bypass valve.

[0013] Compared with the background technology, the control method of the gas water heater described in the present invention has the following beneficial effects: the present invention can avoid the situation where the actual bypass ratio is different from the preset bypass ratio corresponding to the gear position due to the failure of the water flow to fill the bypass pipe when the water flow is small, and the bypass ratio can be adaptively adjusted according to the real-time water flow, so that the gas water heater adopts the target bypass ratio to control heating, thereby reducing the error of the water outlet temperature.

[0014] In one embodiment, the method further comprises:

[0015] If the comparison result indicates that the real-time water flow rate is greater than or equal to the preset threshold value, the preset bypass ratio corresponding to the current gear position of the bypass valve is set as the target bypass ratio.

[0016] In one embodiment, if the real-time water flow rate is less than a preset threshold, obtaining a target bypass ratio according to the real-time water flow rate includes:

[0017] If the real-time water flow rate is less than a preset threshold, obtaining the current gear position of the bypass valve;

[0018] The target bypass ratio is determined based on the current gear.

[0019] In one embodiment, determining the target bypass ratio based on the current gear position includes:

[0020] Acquire a corresponding target correction parameter based on the current gear position;

[0021] The target bypass ratio is determined based on the target correction parameter and the real-time water flow rate, and the target bypass ratio is positively correlated with the real-time water flow rate.

[0022] In one embodiment, the target correction parameter includes a target first correction parameter and a target second correction parameter, and determining the target bypass ratio based on the target correction parameter and the real-time water flow rate includes:

[0023] The product of the target first correction parameter and the real-time water flow rate is calculated, and the target bypass ratio is determined based on the sum of the product and the target second correction parameter.

[0024] In one embodiment, controlling the operation of the gas water heater based on the target bypass ratio includes:

[0025] Obtaining the water inlet temperature of the gas water heater;

[0026] Calculate the target heat exchanger water temperature of the gas water heater according to the target bypass ratio, the set water outlet temperature and the water inlet temperature;

[0027] The burner of the gas water heater is controlled to perform heating based on the target heat exchanger water temperature.

[0028] In one embodiment, the target heat exchanger water temperature of the gas water heater is calculated according to the target bypass ratio, the set water outlet temperature and the water inlet temperature, including:

[0029] Calculating a first difference between the set water outlet temperature and the water inlet temperature;

[0030] A target heat exchanger water temperature is determined based on the first difference and the target bypass ratio, and the target heat exchanger water temperature is positively correlated with the target bypass ratio.

[0031] In one embodiment, the method further comprises:

[0032] When the gas water heater is in a test state and the bypass valve is in a target gear position, obtaining a test water flow rate at the target gear position;

[0033] If the test water flow rate is less than the preset threshold, obtaining a test bypass ratio;

[0034] Based on the positive correlation between the water flow rate and the bypass ratio, as well as the test bypass ratio and the test water flow rate, the correction parameters under the target gear are calculated and stored.

[0035] In one embodiment, obtaining the test bypass ratio includes:

[0036] Obtain test water inlet temperature, test heat exchanger water temperature and test water outlet temperature;

[0037] Calculate the second difference between the test outlet water temperature and the test inlet water temperature, and the third difference between the test heat exchanger water temperature and the test inlet water temperature respectively;

[0038] The test bypass ratio is determined based on a ratio of the second difference to the third difference.

[0039] The above second technical problem is solved by the following technical solution:

[0040] A gas water heater is used to execute the control method of the gas water heater provided above, and the gas water heater is provided with a bypass valve for multi-speed adjustment.

[0041] Compared with the background technology, the gas water heater described in the present invention has the following beneficial effects: the present invention can avoid the situation where the actual bypass ratio is different from the preset bypass ratio corresponding to the gear position due to the failure of water flow to fill the bypass pipe when the water flow is small, and the bypass ratio can be adaptively adjusted according to the real-time water flow, so that the gas water heater adopts the target bypass ratio to control heating, thereby reducing the error of the water outlet temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of a gas water heater according to an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of a gas water heater according to an embodiment of the present invention;

[0045] Figure 3 A schematic flow chart of a control method for a gas water heater according to an embodiment of the present invention;

[0046] Figure 4 Schematic diagram of a flow chart of a method for controlling a gas water heater according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] During the use of a gas water heater, if it is turned off and restarted within a short period of time, the water heater needs to be re-ignited and cannot output hot water in time, which may cause some low-temperature water in the hot water pipe, resulting in large fluctuations in the outlet water temperature after restarting, affecting the user experience. The gas water heater is provided with a bypass pipe on the water inlet pipe and the water outlet pipe. The bypass ratio is controlled by the bypass valve to control the water volume in the bypass pipe, so that overflow energy is generated in the heat exchange tube. Controlling the storage and release of the overflow energy can control the temperature fluctuation during the second startup. Each gear position of the bypass valve has its fixed bypass ratio. The controller will store the fixed bypass ratio corresponding to each gear position, and the required heat exchanger water temperature can be calculated according to the fixed bypass ratio, and the burner power can be adjusted according to the calculated heat exchanger water temperature. However, during the operation of the gas water heater, when the bypass valve gear position remains unchanged, the actual bypass ratio may also be affected by the current water flow rate. When the water flow rate is small, the water flow may not be able to fill the bypass pipe. There is a deviation between the actual bypass ratio and the fixed bypass ratio corresponding to the current bypass valve gear position, which leads to problems in the logic of the gas water heater using a fixed bypass ratio for calculation. Based on this, an embodiment of the present invention provides a control method for a gas water heater.

[0052] According to an embodiment of the present invention, on the one hand, a gas water heater is provided, such as Figure 1As shown, the gas water heater is provided with a heat exchanger, a water flow sensor, a water inlet temperature sensor, a heat exchanger water temperature sensor, a water outlet temperature sensor and a bypass valve for multi-gear adjustment. Among them, the water inlet end of the heat exchanger is provided with a water inlet pipe, the water outlet end of the heat exchanger is provided with a water outlet pipe, and the heat exchanger is provided with a heat exchange tube. The bypass valve is arranged on the bypass pipe, and the bypass pipe is connected with the water inlet pipe and the water outlet pipe respectively. The bypass valve is provided with multiple gears for adjusting the bypass ratio, and each gear corresponds to a different bypass ratio. The water flow sensor is arranged at the water inlet end of the water inlet pipe, and is used to measure the water flow of the inlet water. The water inlet temperature sensor is arranged at the water inlet end of the water inlet pipe, and is used to measure the water inlet temperature of the water inlet. The heat exchanger water temperature sensor is arranged at the water outlet end of the heat exchanger, and is used to measure the water outlet temperature of the heat exchange tube. The water outlet temperature sensor is arranged at the water outlet end of the water outlet pipe, and is used to measure the water outlet temperature.

[0053] In some optional embodiments, such as Figure 2 As shown, a water mixing tank is arranged at the intersection of the bypass pipe and the water outlet pipe of the gas water heater, and the water mixing tank is used for storing energy and mixing water.

[0054] According to an embodiment of the present invention, a control method for a gas water heater is provided, which can be used for the above-mentioned gas water heater. Figure 3 is a flow chart of a control method for a gas water heater according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0055] Step S101, when the gas water heater is in working state, obtain the real-time water flow.

[0056] The water inlet of the gas water heater is equipped with a water flow sensor. When the gas water heater is turned on, the real-time water flow is obtained through the water flow sensor. Before the gas water heater is turned on, the user can set the outlet water temperature according to the needs to indicate the desired outlet water temperature.

[0057] Step S102: if the real-time water flow rate is less than a preset threshold, a target bypass ratio is obtained according to the real-time water flow rate.

[0058] The preset threshold is used to characterize the water flow threshold, which is determined based on the equipment parameters of the gas water heater, including rated power, heating efficiency, water tank capacity, etc. These equipment parameters have been determined in the design phase of the gas water heater and stored in the control system or related database of the gas water heater. In the early stage, the corresponding preset thresholds are set for different models of gas water heaters through testing.

[0059] The real-time water flow rate is compared with the preset threshold value to obtain a comparison result. The comparison operation can be a simple numerical comparison, a threshold judgment or a more complex algorithm processing, and the comparison result obtained includes that the real-time water flow rate is less than the preset threshold value, and the real-time water flow rate is greater than or equal to the preset threshold value.

[0060] The target bypass ratio is used to adjust the water temperature of the heat exchanger of the gas water heater so that the final outlet water temperature meets the set outlet water temperature. According to the comparison result between the real-time water flow rate and the preset threshold, the bypass ratio may need to be adjusted to obtain the target bypass ratio. Different adjustment methods can be used for different comparison results, including using a fixed value as the target bypass ratio, calculating the corresponding target bypass ratio based on the real-time water flow rate, etc.

[0061] In this embodiment, if the real-time water flow rate is less than the preset threshold value, it indicates that the real-time water flow rate is small, and the bypass ratio is corrected according to the real-time water flow rate, so as to calculate the target bypass ratio. In the calculation relationship between the target bypass ratio and the real-time water flow rate, the target bypass ratio is positively correlated with the real-time water flow rate.

[0062] Step S103, controlling the operation of the gas water heater based on the target bypass ratio while keeping the current gear position of the bypass valve unchanged.

[0063] Among them, the target bypass ratio is less than the preset bypass ratio corresponding to the current gear of the bypass valve. The preset bypass ratio is a fixed bypass ratio corresponding to each gear of the bypass valve, which is a pre-set fixed constant and is usually determined based on the balance of the design parameters, working efficiency and user needs of the gas water heater. When the bypass valve does not change, that is, in the same gear, the corresponding heat exchanger water temperature is calculated according to the target bypass ratio, and then the heating power of the gas water heater can be adjusted according to the heat exchanger water temperature, so as to control the outlet water temperature to reach the set outlet water temperature.

[0064] The control method of the gas water heater provided by the embodiment of the present invention obtains the real-time water flow when the gas water heater is in working state; if the real-time water flow is less than the preset threshold, the target bypass ratio is obtained according to the real-time water flow; and the operation of the gas water heater is controlled based on the target bypass ratio while keeping the current gear position of the bypass valve unchanged. The present invention can avoid the situation that the actual bypass ratio is different from the preset bypass ratio corresponding to the gear position due to the failure of the water flow to fill the bypass pipe when the water flow is small, and the bypass ratio can be adaptively adjusted according to the real-time water flow, so that the gas water heater uses the target bypass ratio to control heating, thereby reducing the error of the outlet water temperature.

[0065] In some optional implementations, the control method of the gas water heater further includes: if the real-time water flow rate is greater than or equal to a preset threshold, setting a preset bypass ratio corresponding to the current gear position of the bypass valve as a target bypass ratio.

[0066] Each gear of the bypass valve, especially the preset bypass ratio, is a fixed constant, which is usually determined based on the balance between the design parameters of the water heater, working efficiency and user needs. For example, the preset threshold is 5.5L, and when the real-time water flow rate is ≥5.5L, the preset bypass ratio corresponding to the current gear of the bypass valve is used as the target bypass ratio.

[0067] When the real-time water flow rate is greater than or equal to the preset threshold, the preset bypass ratio corresponding to the current gear position of the bypass valve is directly set as the target bypass ratio. The gas water heater will adjust its working state according to the preset bypass ratio to adapt to the current water flow demand.

[0068] According to an embodiment of the present invention, a control method for a gas water heater is provided, which can be used for the above-mentioned gas water heater, and the method comprises the following steps:

[0069] Step S201, when the gas water heater is in working state, obtain the real-time water flow.

[0070] Please refer to step S101 in the above embodiment for details, which will not be described again here.

[0071] Step S202: If the real-time water flow rate is less than a preset threshold, a target bypass ratio is obtained according to the real-time water flow rate.

[0072] Specifically, step S202 includes: if the real-time water flow rate is less than a preset threshold, obtaining the current gear position of the bypass valve; and determining a target bypass ratio based on the current gear position.

[0073] The bypass valve is provided with multiple gears, each gear has a corresponding bypass ratio, and when it is determined that the real-time water flow is less than a preset threshold value, the current gear of the bypass valve is further obtained. According to the current gear of the bypass valve, the target bypass ratio corresponding to the gear can be determined. For example, the bypass ratio corresponding to different gears can be set, and the bypass ratio corresponding to the gear can also be calculated according to the gear and a specific formula.

[0074] Step S203, controlling the operation of the gas water heater based on the target bypass ratio while keeping the current gear position of the bypass valve unchanged.

[0075] Please refer to step S103 in the above embodiment for details, which will not be described again here.

[0076] In some optional implementations, determining the target bypass ratio based on the current gear position includes:

[0077] Step S2021, obtaining corresponding target correction parameters based on the current gear position.

[0078] Each gear position of the bypass valve is set to have its corresponding target correction coefficient, and the corresponding relationship between the bypass valve gear position and the target correction coefficient is pre-stored in the control system of the gas water heater, which can be stored in the form of a mapping table. After determining the gear position of the bypass valve, the target correction coefficient corresponding to the gear position is determined according to the pre-stored mapping table.

[0079] Step S2022, determining a target bypass ratio based on the target correction parameter and the real-time water flow rate.

[0080] Among them, the target bypass ratio is positively correlated with the real-time water flow rate.

[0081] A relational expression among a target correction parameter, a real-time water flow rate and a target bypass ratio is preset, and the target bypass ratio can be calculated through the target correction parameter, the real-time water flow rate and the relational expression.

[0082] Further, the target correction parameter includes a target first correction parameter and a target second correction parameter, and the above step S2022 includes: calculating the product of the target first correction parameter and the real-time water flow, and determining the target bypass ratio based on the sum of the product and the target second correction parameter.

[0083] The target bypass ratio is determined according to the following formula:

[0084] P L =k×L+A

[0085] Among them, P L represents the target bypass ratio, k represents the first correction parameter, A represents the second correction parameter, and L represents the real-time water flow rate.

[0086] In some optional implementations, controlling the operation of the gas water heater based on the target bypass ratio in step S103 includes:

[0087] Step S301, obtaining the water inlet temperature of the gas water heater.

[0088] The water inlet pipe of the gas water heater is provided with a water inlet temperature sensor, and the water inlet temperature is measured by the water inlet temperature sensor. The measured water inlet temperature at this time is the real-time water inlet temperature after determining the target bypass ratio.

[0089] Step S302, calculating the target heat exchanger water temperature of the gas water heater according to the target bypass ratio, the set water outlet temperature and the water inlet temperature.

[0090] There is a corresponding relationship between the bypass ratio, the set water outlet temperature, the water inlet temperature and the heat exchanger water temperature. When the target bypass ratio, the set water outlet temperature and the water inlet temperature are known, the target heat exchanger water temperature of the gas water heater can be calculated.

[0091] Specifically, step S302 includes:

[0092] Step S3021, calculating and setting a first difference between the outlet water temperature and the inlet water temperature;

[0093] Step S3022: determining a target heat exchanger water temperature based on the first difference and the target bypass ratio.

[0094] Among them, the target heat exchanger water temperature is positively correlated with the target bypass ratio.

[0095] Specifically, the corresponding relationship between the target bypass ratio, the inlet water temperature, the set outlet water temperature and the target heat exchanger water temperature is as follows:

[0096] P=1-(T c -T j ) / (T h -T j )

[0097] Where P is the target bypass ratio, T c Indicates the setting of the outlet water temperature, T j Indicates the inlet water temperature, T h Indicates the target heat exchanger water temperature.

[0098] In this embodiment, the target heat exchanger water temperature can be derived from the above relationship as follows:

[0099]

[0100] Among them, (T c -T j ) represents the first difference between the outlet water temperature and the inlet water temperature. The target heat exchanger water temperature is positively correlated with the target bypass ratio. The larger the target bypass ratio, the larger the target heat exchanger water temperature.

[0101] Step S303, controlling the burner of the gas water heater to heat based on the target heat exchanger water temperature.

[0102] The target heat exchanger water temperature indicates the temperature at which the water tank needs to be heated. The heating power required to heat the heat exchange tube to the temperature can be determined according to the target heat exchanger water temperature, and the gas water heater is controlled to perform heating according to the heating power.

[0103] In some optional implementations, the control method of the gas water heater provided in the above implementations further includes a method for determining correction parameters, and the correction parameters are obtained by testing in a test phase before the gas water heater is officially used, and specifically include the following steps:

[0104] Step S401, when the gas water heater is in a test state and the bypass valve is in a target gear position, obtaining a test water flow at the target gear position.

[0105] The target gear can be any gear, and the correction parameters corresponding to each gear need to be measured during the test phase. Assume that the currently measured gear is the target gear. When the bypass valve of the gas water heater is at the target gear, obtain the water flow rate after the gas water heater is started (i.e., the test water flow rate). Specifically, it can be measured by a water flow sensor installed in the water inlet pipe.

[0106] Step S402: if the test water flow rate is less than a preset threshold, obtain a test bypass ratio.

[0107] The test bypass ratio is the bypass valve opening corresponding to the target gear. When the test water flow is less than the preset threshold, the current test bypass ratio is obtained. The water flow is related to the opening of the faucet of the gas water heater. Multiple test water flows can be obtained by adjusting the faucet, and the test bypass ratio corresponding to each test water flow is obtained to obtain multiple groups of test water flows and test bypass ratios.

[0108] In some optional implementations, obtaining the test bypass ratio includes:

[0109] Step S4021, obtaining the test water inlet temperature, the test heat exchanger water temperature and the test water outlet temperature;

[0110] Step S4022, respectively calculating a second difference between the test outlet water temperature and the test inlet water temperature, and a third difference between the test heat exchanger water temperature and the test inlet water temperature;

[0111] Step S4023, determining a test bypass ratio based on a ratio of the second difference to the third difference.

[0112] Specifically, the test bypass ratio is determined according to the following formula:

[0113] P′=1-(T′ c -T′ j ) / (T′ h -T′ j )

[0114] In this embodiment, P′ represents the test bypass ratio, T′ c Indicates the test water outlet temperature, T′ j Indicates the test water inlet temperature, T′ h Indicates the water temperature of the test heat exchanger, (T′ c -T′ j ) represents the second difference, (T′ h -T′ j ) represents the third difference.

[0115] Step S403, based on the positive correlation between the water flow rate and the bypass ratio, as well as the test bypass ratio and the test water flow rate, calculate and store the correction parameters under the target gear.

[0116] The water flow rate and the bypass ratio are positively correlated. A relationship formula for the water flow rate and the bypass ratio is provided. At least one set of test water flow rate and test bypass ratio is substituted into the relationship formula to calculate the correction parameters corresponding to the target gear position. For each gear position of the bypass valve, the corresponding correction parameters can be calculated using this implementation.

[0117] For example, the relationship between water flow rate and bypass ratio is k=(P L-A) / L, when the test water flow rate is 3L, the corresponding test bypass ratio is 0.16; when the test water flow rate is 3.5L, the corresponding test bypass ratio is 0.185. Substituting the numerical values ​​into the relationship, it can be calculated that the first correction parameter k is 0.05 and the second correction parameter A is 0.01.

[0118] According to an embodiment of the present invention, a control method for a gas water heater is provided. Figure 4 As shown, when the gas water heater is turned on from the standby state, it is first determined whether the water flow rate is greater than or equal to the preset threshold value. In this embodiment, the preset threshold value is B. If the water flow rate is greater than or equal to B, the bypass ratio is adjusted to the pre-stored constant bypass ratio, and then the water temperature of the heat exchanger is calculated based on the pre-stored constant bypass ratio and the combustion and heating are stabilized. If the water flow rate is less than the preset threshold value, the gear position of the bypass valve is further determined, and the first correction parameter k and the second correction parameter A corresponding to the gear position are selected according to the gear position. As an example only, in this embodiment, the bypass valve is provided with three gear positions, and the actual number of gear positions is not limited. The bypass ratio is calculated according to the corresponding correction parameter and the pre-stored formula. The pre-stored formula can refer to the above step a2. After the bypass ratio is calculated, the corresponding water temperature of the heat exchanger is calculated and the combustion and heating are stabilized. In this embodiment, the corresponding bypass ratio can be determined according to the water flow rate, and then the change of the gas water heater load can be adjusted according to the bypass ratio. When determining the bypass ratio corresponding to the water flow rate, it can also be directly determined by looking up a table, and the corresponding relationship between the water flow rate and the bypass ratio can be stored in the table.

[0119] According to an embodiment of the present invention, a gas water heater is provided, which is used to execute the control method of the gas water heater of the above embodiment, including: a water flow acquisition module, which is used to acquire the real-time water flow when the gas water heater is in operation; a bypass ratio determination module, which is used to obtain a target bypass ratio according to the real-time water flow if the real-time water flow is less than a preset threshold, and the target bypass ratio is positively correlated with the real-time water flow; a water heater control module, which is used to control the operation of the gas water heater based on the target bypass ratio while keeping the current gear position of the bypass valve unchanged, and the target bypass ratio is less than the preset bypass ratio corresponding to the current gear position of the bypass valve.

[0120] An embodiment of the present invention also provides a gas water heater having the above-mentioned control device of the gas water heater, and the gas water heater includes: one or more processors, a memory, and an interface for connecting various components, including a high-speed interface and a low-speed interface. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the gas water heater, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple gas water heaters can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system).

[0121] The processor may be a central processing unit, a network processor or a combination thereof. The processor may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0122] The memory stores instructions executable by at least one processor, so that the at least one processor executes the method shown in the above embodiment.

[0123] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created according to the use of the gas water heater, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the gas water heater via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0124] The memory may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid state drive; the memory may also include a combination of the above types of memory.

[0125] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A control method for a gas water heater, characterized in that: The method comprises: When the gas water heater is in working state, obtain the real-time water flow; If the real-time water flow rate is less than a preset threshold, a target bypass ratio is obtained according to the real-time water flow rate, and the target bypass ratio is positively correlated with the real-time water flow rate; Under the condition that the current gear position of the bypass valve remains unchanged, the gas water heater is controlled to operate based on the target bypass ratio, and the target bypass ratio is smaller than the preset bypass ratio corresponding to the current gear position of the bypass valve.

2. The method according to claim 1, characterized in that The method further comprises: If the real-time water flow rate is greater than or equal to the preset threshold value, the preset bypass ratio corresponding to the current gear position of the bypass valve is set as the target bypass ratio.

3. The method according to claim 1, characterized in that If the real-time water flow rate is less than a preset threshold, obtaining a target bypass ratio according to the real-time water flow rate includes: If the real-time water flow rate is less than a preset threshold, obtaining the current gear position of the bypass valve; The target bypass ratio is determined based on the current gear.

4. The method according to claim 3, characterized in that The determining the target bypass ratio based on the current gear position includes: Acquire a corresponding target correction parameter based on the current gear position; The target bypass ratio is determined based on the target correction parameter and the real-time water flow rate, and the target bypass ratio is positively correlated with the real-time water flow rate.

5. The method according to claim 4, characterized in that The target correction parameter includes a target first correction parameter and a target second correction parameter, and determining the target bypass ratio based on the target correction parameter and the real-time water flow rate includes: The product of the target first correction parameter and the real-time water flow rate is calculated, and the target bypass ratio is determined based on the sum of the product and the target second correction parameter.

6. The method according to claim 1, characterized in that The controlling the gas water heater to operate based on the target bypass ratio includes: Obtaining the water inlet temperature of the gas water heater; Calculate the target heat exchanger water temperature of the gas water heater according to the target bypass ratio, the set water outlet temperature and the water inlet temperature; The burner of the gas water heater is controlled to perform heating based on the target heat exchanger water temperature.

7. The method according to claim 6, characterized in that The step of calculating the target heat exchanger water temperature of the gas water heater according to the target bypass ratio, the set water outlet temperature and the water inlet temperature includes: Calculating a first difference between the set water outlet temperature and the water inlet temperature; A target heat exchanger water temperature is determined based on the first difference and the target bypass ratio, and the target heat exchanger water temperature is positively correlated with the target bypass ratio.

8. The method according to claim 1, characterized in that The method further comprises: When the gas water heater is in a test state and the bypass valve is in a target gear position, obtaining a test water flow rate at the target gear position; If the test water flow rate is less than the preset threshold, obtaining a test bypass ratio; Based on the positive correlation between the water flow rate and the bypass ratio, as well as the test bypass ratio and the test water flow rate, the correction parameters under the target gear are calculated and stored.

9. The method according to claim 8, characterized in that The step of obtaining the test bypass ratio comprises: Obtain test water inlet temperature, test heat exchanger water temperature and test water outlet temperature; Calculate the second difference between the test outlet water temperature and the test inlet water temperature, and the third difference between the test heat exchanger water temperature and the test inlet water temperature respectively; The test bypass ratio is determined based on a ratio of the second difference to the third difference.

10. A gas water heater, characterized in that: Used to execute the method described in any one of claims 1 to 9 above, the gas water heater is provided with a bypass valve for multi-speed adjustment.

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